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Home > Products > Integrated Circuits (ICs) > Embedded > Application Specific Microcontrollers

Microchip Technology AT97SC3205T-G3M4B-10

Name: AT97SC3205T-G3M4B-10
Brand: Microchip Technology
SKU: AT97SC3205T-G3M4B-10
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AT97SC3205T-G3M4B-10

Manufacturer:: Microchip Technology

Category:: Application Specific Microcontrollers

Package:: 32-VFQFN Exposed Pad

Datasheet:: AT97SC3205T-G3M4B-10.pdf

Description:: PROD STD COM I2C TPM 4X4 32VQFN

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Product details

Overview

AT97SC3205T-G3M4B-10 from Microchip Technology (formerly Atmel) is a TCG-compliant Trusted Platform Module (TPM) 1.2 security IC integrating an AVR® RISC microprocessor, hardware asymmetric crypto engine, FIPS-140-2 certified RNG/AES/SHA/RSA engines, and 2066-byte NV user storage. It operates at 3.3V with I²C interface up to 400 kHz and supports industrial temperature range (−40°C to +85°C). Used in embedded systems requiring hardware-rooted trust for secure boot and key management.

For engineers reviewing the AT97SC3205T-G3M4B-10 datasheet, AT97SC3205T-G3M4B-10 pinout, AT97SC3205T-G3M4B-10 application, or AT97SC3205T-G3M4B-10 equivalent, this page delivers verified technical context, package-specific pin roles, real-world use value per application, and validated alternative options aligned with TPM 1.2 system integration requirements.

Technical Context

The AT97SC3205T-G3M4B-10 implements the full TCG TPM 1.2 specification in a single-chip solution, using an on-die AVR 8-bit RISC CPU to execute firmware-defined cryptographic primitives and command dispatch logic. Its hardware crypto engine accelerates RSA key generation and signing, SHA-1 hashing, HMAC authentication, and AES encryption without host CPU involvement.

It features dual I²C-compatible serial interfaces (SM_DAT/SM_CLK), dedicated physical presence (PP/GPIO) and tamper detection (XTAMPER via TestBI/GPIO/XTAMPER), plus low-power sleep recovery via TWI_Wakeup# pins. Internal EEPROM stores RSA keys and 2066 bytes of user-defined NV data, managed by dynamic memory allocation firmware.

Key Specifications

Parameter	Value and Actual Design Meaning
TCG Compliance	Full TPM 1.2 specification implementation - enables standardized secure boot, attestation, and sealed storage in PC and embedded platforms.
I²C Interface Speed	400 kHz Fast Mode / 100 kHz Standard Mode - supports high-throughput command/response cycles with minimal bus overhead.
Supply Voltage	3.3 V ±10% - requires tight decoupling (2200–4700 pF near each VCC pin, 0.1 µF shared node) for stable crypto operation across temperature.
FIPS-140-2 Certification	Covers RNG, HMAC, AES, SHA, and RSA engines - satisfies U.S. federal and enterprise security policy requirements for cryptographic module validation.
NV User Storage	2066 bytes of EEPROM-based non-volatile space - sufficient for storing platform configuration hashes, certificates, or custom policy data without external memory.
Operating Temperature	−40°C to +85°C - qualified for industrial-grade deployment in network infrastructure, medical devices, and edge controllers.
Package Options	28-pin Thin TSSOP (4.4 × 9.7 mm, 0.65 mm pitch) or 32-pad QFN (4.0 × 4.0 mm, 0.40 mm pitch) - both RoHS-compliant and lead-free.

Pinout & Package

AT97SC3205T-G3M4B-10 is offered in two RoHS-compliant packages: 28-pin Thin TSSOP (28X1, 4.4 mm × 9.7 mm body, 0.65 mm pitch) and 32-pad Very Thin QFN (32M3, 4.0 mm × 4.0 mm body, 0.40 mm pitch). Both packages include GND-exposed thermal pad (QFN center pad tied internally to GND).

Pin/Terminal	Circuit Role	Design Meaning
VCC	Power supply input	3.3 V main supply; requires localized 2200–4700 pF bypass caps within 5 mm of each pin and shared 0.1 µF cap ≤10 mm from device.
GND	System ground reference	Multiple GND pins provide low-impedance return paths; QFN center pad must be connected to GND plane for thermal and noise performance.
SM_DAT / SM_CLK	I²C bidirectional data/clock	Supports 400 kHz Fast Mode; pull-up values critical - 800 Ω on SM_DAT and 1.5 kΩ on SM_CLK recommended for reliable timing.
LRESET#	Active-low hardware reset	Minimum 2 µs pulse required; must remain asserted until VCC stabilizes at power-up to ensure deterministic TPM initialization.
PP/GPIO	Physical presence indicator	Active-high GPIO used to signal hardware-level authorization for sensitive operations (e.g., clearing owner hierarchy); internal pull-down.
TWI_Wakeup#	Low-power sleep recovery	Two-pin active-low wake mechanism - both pins must be pulsed low to exit deep-sleep mode after TPM_DeepSleep command.
GPIO-Express-00	Dedicated NV-indexed GPIO	Maps to TPM_NV_INDEX_GPIO_00; internal pull-up; used for persistent state signaling (e.g., secure boot status flag) stored in NV memory.
TestBI/GPIO/XTAMPER	Multi-function terminal	Configurable as tamper-detection input (XTAMPER) or GPIO; not legacy BADD-capable; tie to GND if unused.

Key Features

Feature	Design Value
Hardware Asymmetric Crypto Engine	Offloads RSA key generation (up to 2048-bit), signing, and verification from host CPU - reduces latency and eliminates software-side side-channel exposure.
FIPS-140-2 Certified RNG	On-die entropy source validated for cryptographic key derivation - meets NIST SP 800-90A requirements without external entropy injection.
Internal EEPROM Key Storage	Secure, write-protected EEPROM stores RSA private keys and platform credentials - prevents extraction even under physical probing.
Dynamic Key Cache Management	Automatic SRAM/EERPOM key loading/unloading via TPM_FlushSpecific and TPM_LoadKey2 - no host firmware intervention needed for multi-key workflows.
Low-Power Deep Sleep Mode	Reduces current draw during idle periods; recovery triggered only by TWI_Wakeup# pulse - extends battery life in portable trusted devices.

Applications

Secure Boot Validation	Platform Integrity Attestation
Use Scenario: Verifying firmware image integrity before execution in industrial gateways and medical imaging systems. IC Role / Device Role / Timing Role: TPM acts as root-of-trust anchor, measuring BIOS, bootloader, and OS loader into Platform Configuration Registers (PCRs) using SHA-1. Use Value: Prevents unauthorized firmware modification by cryptographically binding boot sequence to hardware identity - enforced by AT97SC3205T-G3M4B-10's immutable key storage and PCR extend logic.	Use Scenario: Reporting runtime system state to remote management servers in cloud-connected edge controllers. IC Role / Device Role / Timing Role: Generates signed quotes of PCR values and platform configuration upon request via I²C, using internally stored endorsement key. Use Value: Enables verifiable proof of unmodified software stack - AT97SC3205T-G3M4B-10's FIPS-certified RSA signing ensures quote authenticity against replay or spoofing.
Sealed Storage Encryption	Hardware Physical Presence Control
Use Scenario: Protecting encryption keys for encrypted NAND flash in ruggedized field terminals. IC Role / Device Role / Timing Role: Performs symmetric key wrapping/unwrapping using AES-128 and binds decryption to specific PCR states (e.g., "bootloader valid" + "OS loaded"). Use Value: Ensures data remains inaccessible if firmware is compromised - AT97SC3205T-G3M4B-10 enforces binding via hardware-enforced locality checks and NV-stored policies.	Use Scenario: Requiring manual hardware confirmation before performing privileged operations like TPM owner clear or dictionary attack lockout reset. IC Role / Device Role / Timing Role: Monitors PP/GPIO pin state to gate access to sensitive commands; asserts physical presence only when externally asserted high. Use Value: Mitigates remote privilege escalation - AT97SC3205T-G3M4B-10 ties critical administrative functions to physical operator action, preventing automated attacks.

Secure Boot Validation

Platform Integrity Attestation

Use Scenario: Verifying firmware image integrity before execution in industrial gateways and medical imaging systems.

IC Role / Device Role / Timing Role: TPM acts as root-of-trust anchor, measuring BIOS, bootloader, and OS loader into Platform Configuration Registers (PCRs) using SHA-1.

Use Value: Prevents unauthorized firmware modification by cryptographically binding boot sequence to hardware identity - enforced by AT97SC3205T-G3M4B-10's immutable key storage and PCR extend logic.

Use Scenario: Reporting runtime system state to remote management servers in cloud-connected edge controllers.

IC Role / Device Role / Timing Role: Generates signed quotes of PCR values and platform configuration upon request via I²C, using internally stored endorsement key.

Use Value: Enables verifiable proof of unmodified software stack - AT97SC3205T-G3M4B-10's FIPS-certified RSA signing ensures quote authenticity against replay or spoofing.

Sealed Storage Encryption

Hardware Physical Presence Control

Use Scenario: Protecting encryption keys for encrypted NAND flash in ruggedized field terminals.

IC Role / Device Role / Timing Role: Performs symmetric key wrapping/unwrapping using AES-128 and binds decryption to specific PCR states (e.g., "bootloader valid" + "OS loaded").

Use Value: Ensures data remains inaccessible if firmware is compromised - AT97SC3205T-G3M4B-10 enforces binding via hardware-enforced locality checks and NV-stored policies.

Use Scenario: Requiring manual hardware confirmation before performing privileged operations like TPM owner clear or dictionary attack lockout reset.

IC Role / Device Role / Timing Role: Monitors PP/GPIO pin state to gate access to sensitive commands; asserts physical presence only when externally asserted high.

Use Value: Mitigates remote privilege escalation - AT97SC3205T-G3M4B-10 ties critical administrative functions to physical operator action, preventing automated attacks.

Equivalent & Alternatives

The following parts are listed as comparable options for similar TPM 1.2 security module applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ST33HTPH2E28A	28-pin TSSOP, 3.3 V, TPM 1.2, integrated SHA-1/RSA engine, 128-byte NV storage	Lower NV capacity (128 B vs. 2066 B); no dedicated XTAMPER pin; uses SPI instead of I²C	Select when SPI interface preferred and NV storage needs are minimal; verify physical presence and tamper handling match system architecture.
Infineon SLB9665TT2.0	32-pin QFN, 3.3 V, TPM 1.2, FIPS 140-2 Level 2 certified, 2048-byte NV storage, I²C interface	Similar NV size and I²C support; higher certification level (Level 2 vs. Level 1); different GPIO mapping and reset timing behavior	Choose for enhanced physical security assurance; validate LRESET# pulse width (≥10 µs) and GPIO-Express-00 functional equivalence in firmware.

Compared with ST33HTPH2E28A and SLB9665TT2.0, the AT97SC3205T-G3M4B-10 offers the largest user-accessible NV storage (2066 B), native I²C support matching common embedded host buses, and explicit GPIO-Express-00 indexing for persistent state tracking - making it optimal for resource-constrained industrial systems requiring flexible, firmware-managed trust state.

Availability

AT97SC3205T-G3M4B-10 is available at Aetrix Electronics and suitable for secure boot validation, platform attestation, sealed storage encryption, and hardware physical presence control requiring stable component supply across industrial temperature ranges and long-lifecycle deployments.

Supply support for AT97SC3205T-G3M4B-10 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology acquired Atmel in 2016 and maintains full product support, documentation, and qualification for legacy Atmel security ICs including the AT97SC3205T series.

The AT97SC3205T belongs to Atmel's Trusted Platform Module family, designed specifically to deliver certified, single-chip TPM 1.2 functionality for embedded systems where hardware-rooted security, low power, and compact footprint are essential.

FAQ

What communication interface does the AT97SC3205T-G3M4B-10 use?

The AT97SC3205T-G3M4B-10 uses a standard I²C interface with SM_DAT and SM_CLK pins supporting both 100 kHz Standard Mode and 400 kHz Fast Mode operation. Pull-up resistors of 800 Ω on SM_DAT and 1.5 kΩ on SM_CLK are recommended for reliable 400 kHz timing. The AT97SC3205T-G3M4B-10 does not support SPI or other serial protocols.

Does the AT97SC3205T-G3M4B-10 support FIPS-140-2 certification?

Yes, the AT97SC3205T-G3M4B-10 is FIPS-140-2 certified for its hardware random number generator (RNG), HMAC, AES, SHA, and RSA cryptographic engines. This certification covers the on-die modules used for key generation, hashing, and encryption - ensuring compliance with U.S. federal cryptographic standards. The AT97SC3205T-G3M4B-10 certificate applies to the full device as shipped, not just individual blocks.

What is the purpose of the TWI_Wakeup# pins on the AT97SC3205T-G3M4B-10?

The TWI_Wakeup# pins (two dedicated terminals) enable low-power sleep recovery on the AT97SC3205T-G3M4B-10. After issuing the TPM_DeepSleep command, the device enters ultra-low-power mode; both TWI_Wakeup# pins must be pulsed active-low simultaneously to resume operation. This dual-pin requirement prevents accidental wake events and enhances reliability in noisy industrial environments. The AT97SC3205T-G3M4B-10 uses this mechanism exclusively for deep-sleep exit - no alternate wake sources exist.

How much non-volatile user storage does the AT97SC3205T-G3M4B-10 provide?

The AT97SC3205T-G3M4B-10 provides 2066 bytes of user-defined non-volatile (NV) storage in internal EEPROM. This space is accessible via TCG-defined NV commands (e.g., TPM_NV_DefineSpace, TPM_NV_Write) and persists across power cycles. Unlike general-purpose EEPROM, this NV area is partitioned, access-controlled, and bound to PCR states - the AT97SC3205T-G3M4B-10 enforces these protections in hardware firmware.

What temperature range is specified for the AT97SC3205T-G3M4B-10?

The AT97SC3205T-G3M4B-10 is qualified for industrial temperature operation from −40°C to +85°C. This rating applies to both the 28-pin Thin TSSOP and 32-pad QFN package variants. The device's internal voltage regulation, thermal design, and FIPS-certified crypto engines are characterized across this full range - the AT97SC3205T-G3M4B-10 maintains specification compliance without derating in industrial control cabinets or outdoor edge nodes.

AT97SC3205T-G3M4B-10 Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 32-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

Programmable:: Not Verified

Applications:: Trusted Platform Module (TPM)

Core Processor:: AVR

Program Memory Type:: EEPROM

Controller Series:: -

RAM Size:: -

Interface:: I2C

Number of I/O:: 4

Voltage - Supply:: 3.3V

Operating Temperature:: 0°C ~ 70°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 32-VQFN (4x4)

AT97SC3205T-G3M4B-10 FAQ

1.How can I place an order for AT97SC3205T-G3M4B-10 through Aetrix?

Please submit a Request for Quotation (RFQ) for AT97SC3205T-G3M4B-10 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for AT97SC3205T-G3M4B-10 reliable?

The price and inventory of AT97SC3205T-G3M4B-10 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205T-G3M4B-10 is usually 5 days.

3.What payment methods are accepted for AT97SC3205T-G3M4B-10?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205T-G3M4B-10 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AT97SC3205T-G3M4B-10?

AT97SC3205T-G3M4B-10 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AT97SC3205T-G3M4B-10 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for AT97SC3205T-G3M4B-10?

For technical support, including AT97SC3205T-G3M4B-10 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205T-G3M4B-10 requirements.

6.How does Aetrix verify that AT97SC3205T-G3M4B-10 is sourced from the original manufacturer or authorized distributors?

All AT97SC3205T-G3M4B-10 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AT97SC3205T-G3M4B-10 meets industry standards.

7.What is the process for return or replacement of AT97SC3205T-G3M4B-10?

All AT97SC3205T-G3M4B-10 units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205T-G3M4B-10, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The AT97SC3205T-G3M4B-10 part is unused and in its original packaging.

Return procedure for AT97SC3205T-G3M4B-10:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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